(unstack b4 b7)
(putdown b4)
(unstack b7 b3)
(stack b7 b4)
(unstack b3 b6)
(stack b3 b7)
(pickup b5)
(stack b5 b3)
(pickup b6)
(stack b6 b5)
(pickup b2)
(stack b2 b6)
(pickup b1)
(stack b1 b2)
; cost = 14 (unit cost)
